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Did you actually enter that exact command? If so, then I'm not surprised it failed. tar cvzf ..... isn't correct, it should be tar -czvf .....
Presumably, you didn't actually type <backup_dir>, you did put in a real directory name here?
If you just made a typo while posting here, then run the command again without the v option (tar -czf). This will stop tar from displaying the name of every file it processes, so you should be able to see any earlier error messages.
Apologies if I'm stating the obvious a bit with these, but I've found that very often it's the simplest mistakes that are the hardest to spot.
I've got to say I don't really know what could be causing that. You could try running without the z option, so that the output file isn't compressed. This will tell you whether it's tar or gzip that's causing the problem.
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